Aluminum hull anodes are sacrificial anodes for boats and other submerged structures, made from an aluminum alloy that corrodes preferentially to protect the metal hull and its components from galvanic corrosion. They are used in brackish and seawater, providing high amperage output and lightweight, which makes them efficient, cost-effective, and easy to install. These rectangular anodes are chosen for their superior protection in marine environments and are a more eco-friendly alternative to traditional zinc anodes because they are cadmium-free.